The embodiment of the present invention provides a low-voltage power distribution network topology reconstruction method and device, wherein the method comprises the steps of determining the incidencerelation vectors of the buses according to the sequential voltages of the buses and a linear regression equation of an Lasso algorithm; combining the incidence relation vectors of the buses into a correlation coefficient matrix, and determining a target correlation coefficient matrix of the correlation coefficient matrix via an and rule; when the Lasso algorithm does not satisfy a sufficient condition, determining a determination matrix of a voltage matrix by the preset function relationship; determining the positions of the elements greater than 0 in the determination matrix, and modifying the elements at the corresponding positions in the target correlation coefficient matrix as 0; determining the buses corresponding to the positions of the non-zero elements in the modified target correlation coefficient matrix as the buses that are directly connected in a zone area. According to the embodiment of the present invention, the calculation process of correcting the Lasso algorithm is simpler and more convenient, and the accuracy of a network topological diagram model established by the corrected matrix is higher.